Search found 644 matches

by 1024MAK
13 Jan 2021 19:37
Forum: PROGRAMMING
Topic: "The Source" revisited - ReSource
Replies: 3
Views: 61

Re: "The Source" revisited - ReSource

The times when a ‘like’ button would come in handy ;)

Thanks Martin, Bill and Dave 8-) :D

Mark
by 1024MAK
11 Jan 2021 02:44
Forum: HARDWARE
Topic: Building a replacement MTX PSU
Replies: 153
Views: 60039

Re: Building a replacement MTX PSU

LEDs are light emitting diodes. Like a normal diode, once the forward voltage gets to the ‘turn on’ value, they start to conduct current. With a silicon diode, this is about 0.6V. With a LED, it’s between about 1.8V to 3.6V depending on the type/colour. By forward voltage, I mean a positive voltage ...
by 1024MAK
08 Jan 2021 14:16
Forum: HARDWARE
Topic: Building a replacement MTX PSU
Replies: 153
Views: 60039

Re: Building a replacement MTX PSU

The tests were a bit mixed: checking that the diodes are filtering out the 'wrong' polarity resulted in 0.08V or 0.07V when testing (with a 1A fuse in place), so almost nothing but not quite. I retried this a few times and got the same results. Is this within the bounds of expected behaviour? You m...
by 1024MAK
07 Jan 2021 02:07
Forum: HARDWARE
Topic: Building a replacement MTX PSU
Replies: 153
Views: 60039

Re: Building a replacement MTX PSU

Looking good :D One thing, where you have cut the tracks, just use a sharp craft or ‘box cutter’ knife to remove the ‘whisker’ of copper track that is left at the edge of where you cut it and the edge of the adjacent track. For testing, use either a AC or DC supply with an output of between 5V (AC o...
by 1024MAK
27 Dec 2020 20:31
Forum: INTRODUCE YOURSELF
Topic: Hello
Replies: 3
Views: 2443

Re: Hello

Hi, I'm Paul. A belated hello and welcome to you. Although a lot of people have had more time on theirs hands due to the current circumstances, I’ve been rather busier than normal, so visits to forums have not been as frequent or long as I would have liked. What a wonderful bit of history you have ...
by 1024MAK
25 Dec 2020 01:41
Forum: REMEMOrizer
Topic: 3D printed REMEMOrizer case.
Replies: 7
Views: 319

Re: 3D printed REMEMOrizer case.

Excellent 👍

Have a good time at Christmas ;)

Mark
by 1024MAK
25 Dec 2020 00:53
Forum: NEW HARDWARE
Topic: RS232?
Replies: 3
Views: 257

Re: RS232?

Are you actually going to need or use RS232 +12V / -12V levels, or are you using a TTL logic level RS232 to USB device?

Mark
by 1024MAK
19 Dec 2020 02:11
Forum: REMEMOrizer
Topic: Case/Extension Cable?
Replies: 26
Views: 6826

Re: Case/Extension Cable?

I’m waiting in case there’s a hiccup :lol:

Sorry, couldn’t think of any other case to use that!

Looking good so far, but I don’t have a 3D printer, so will wait for more pictures :mrgreen:

Mark
by 1024MAK
07 Dec 2020 19:59
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 89
Views: 25576

Re: Another Home-Brew - Z180

It’s just so easy to get connector and device pinouts mirrored, due to alternatively working on the underside and the top (component) side. I’ve certainly dropped a clanger before and I know I will do so again at some point. The first time I did this, it was for a four pin DC-DC converter module in ...
by 1024MAK
06 Dec 2020 19:10
Forum: INTRODUCE YOURSELF
Topic: New Member saying hello
Replies: 11
Views: 596

Re: New Member saying hello

Hello Schmit

Welcome back to Memotech Computing :D

Dave’s site (http://primrosebank.net/computers_ov.htm) is a gold mine, careful, you will loose a lot of time as you read through it!

Mark